Gas-engine-control mechanism



Feb. 5, 1929. l 1,700,825

' H. D. MURRAY GAS ENGINE CONTROL MECHANISM Filed Sept. 22, 1924 2 Sheets-Sheet l Feb. 5, 1929. 1,700,825

H. D. MURRAY GAS ENGINE CONTROL MEGHANISM Filed sept. 22, 1924 2 sheets-sheet 2 Patented Feb. 5, i929.

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HARRY D. MURRAY, or enovncirY, PENNSYLVANIA. i

GAS-ENGINE-OONTROL MECHANISM.

Application filed. September 22, 1924. Serial No. 739,149.

Gas engines, especially such as are used in oil and gas well operations, are so arranged as to be conveniently subjected to manual control for the drilling operation and for automatic control inthe use of the engine in pumping the well, or after the drilling is completed. In the present invention a convenient throttle actuating mechanism and speed sensitive mechanism are combined; It is further desirable in .combination with a gas mixer valve to have a bypass of suitlcient capacity to keep the engine operating after the throttle valve is closed and the present invention involves a means by which this may be accomplished. The throttle in a gas engine is rather sensitive for starting and usually starts best with a given throttle. The present invention involves a means for indi eating the throttle opening so that it may be nicely adjusted particularly for the purpose of starting and also Jfor runningconditions if desired. The invention also involves iinproveinents in the speed sensitive mechanism particularly adapting it to this type of engine and for use in connection with a throttle.

The invention is illustrated in the accompanying drawings as follows Fig. 1 shows a central section .th-rough the air and gas mixing valve and the throttle and governor. v ig. 2 a section on the line v2-2'in Fig. 1. Fig. 3 a section on the line 3 3 inFig. 1.

by plates 4C,- tlius delivering air and gas i through the same general mixing valve to a cylinder 4d. Thus gas is admitted through the valve 4 by way of the ring and air is admitted to parts of the valve Within the ring, these being properly proportioned for the purposes of the engine.7 the amount of gas being varied to within 'the range of explosive mixture to varythe power of the engine.

The controlling valve body'l has a diaphragm 5in rwhich is arranged afvalve seat 6. A

Fig. 4 a section on the line 4 4 in Fig. 1.

o'overno-rv valve 7 operates on this seat.

Gas is delivered to the governor valve body through a pipe v8 and to a chamber 9 from which the throttle valve passage 10 communicates to the governor valve chamber 7 a, the gas ordinarily passing by the governor valve in accordance with the requirements of the engine. A throttle valve seat 11 is around the passage'IO and is operated upon byva throttle valve 12. A screw-.threaded stem 13 extends from the valve`12 and an` operating `wheel 14 is secured to the stem. A cable 15 roperates on the operating wheel and runs Vto kseme desired point of control.

The operat? a point -17 is arranged near `the wheel so that the position of the wheel maybe readily ascertained and thus the opening of the throttle indicated. I

A bypass opening 18extends from the inlet chamber 9 to the control valve chamber 7EL so thatwhen the throttle is closed this bypass delivers gas sufficient to maintain the engine `ruiming in idling condition, the amount of gas delivered being proportioned'to theV air going through the mixer valve to maintain an explosive mixture. The bypass may be adjusted bya needle valve 18a. A flange 19 is arranged on the upper part of thebody and this is provided With aI cover 20. A cover frame 21 is mounted on the flange 19 and secures the cover plate inv place. 22 extends throughthe coverplate andis proing wheel 14 has graduations 16 thereon andy A valve stem vided with a head 23. A spring 24 is tensioned between theV head andan adjusting nut 23a on the cover 20. It is of such strength as effect of the ingoing gas7 the preponderance being slightly in favor of the spring in order `to maintain the valve in open position when the valve is not influenced bythe governor.

In order to adjust the spring for different pressures of gas anut 23aN may be adjusted to give the spring tension 'to accomplish this purpose.: f l Y Mountings 25 are arranged on the frame 21 and carry a shaft v26,*tliis shaft beingA locked with the mounting by a sety screw 27.

pulley 23 is driven by the engine (not t,

shown) supplied `by ythe mixing valve, the power being communicated by a belt indicated at 29 inFig. 4. Avgovernor head 3()- is secured to the pulley andgoverno-r weights to practically balance the valve against` the 31 arepivotally mounted onthe head by I means of pins 32. rlhe governorweights have the inwardly extending bell eranlearnis 33 which engage a sliding sleeve 34.' rlhe sliding sleeve is locked to rotate With the head by a pin 35. A spring 36 is arranged within the sleeve and operates against a collar 37, the spring 86 forming t-he centripetal element of the governor and the Weights the centrifugal element. rlhe collar 37 is locked to rotate with the sleeve 34`by means of a pin 38. A

stop cam hub 39 and a thrust screw 40 is screwed onto the shaft against the hub and through the hub operates on the collar 37 to vary the tension of the spring 36. The screw has the groovesI 4l into which the lock screws 42 extend for locking the screw 40 in adjustment. The shaft has the oil openings 43 and 44 by means of Which the different members journaled on the shaft may be lubricated. The sleeve 84 has a groove 45 and a yoke 46 is mounted in this groove. A lever 48 is pivotally connected with the yoke 46. The lever ispivotally mounted on a pin 49 betvveen uprights 50 extending upwardly from the frame. A.he lever has a bell crank arm'l which in position to engage the valve stem head 23 and to deinessand close the valve as the governor sleeve 34 is forced sideivise by the opening Weights through the arm 33. The governor operates in the manner of the ordinary centrifugal governor7 the spring 36 operating against the WeightsA and these varying in' position as the centrifugal force due to ,the rotation of the Weights varies; this diierence being communicated through the leverage to the valve closing the valve or permit-tingit to open in accordance with the speed.

The safety stop hub 39 has a safety cam 52 and as the cam is rotated operates upon the stemy head 23 to close the valve. Av lever 53 extends from the hub 39 and is provided with a pulley 54 which normally rides on the belt 29. Upon the breaking of the belt and the dropping ofthe lever 53 the cam operates to close the'governor valve and shut doivn the engine. 1

lV hat l clain'i as new is K l. ln a. gas engine control n'iechanisni, the

combination with a valve body; anunbal-Y anced governor valve mounted in the body; a spring tending` to open the valve and balancing the same against :fuel pressure-to relieve the governor of the gas andspring load; and a speed sensitive device operating to close the valve.

f2. ln a engine Control mechanism; the con'ibination with a valve body; an unbalanced governor valve mounted in the body;

'a spring tending to open the valve and balance the valve against fuel pressure to relieve the governor of fuel pressure and spring load; a speed sensitive device operating to close the valve; and means for adjusting the spring for different gas pressures.

3. In a gas engine controlmechanism; the

combination of a valve body having a con-V trol valve chamber; an inlet chamber; an unbalanced governor valve controlling the dis charge from the control chamber; a throttle valve controlling the communication between the inlet chamber and the control chamber and having its axis atan angle to the axis of the governor valve; a spring on the governor valve tendine` to oaen the governor throttle valve controlling the communication between the inlet chamber and the control chamber, said throttle valve having its'aXis at an angle to the axis of the governor valve; a spring on the governor valve tending to open the governor valve and balancing the same against fuel pressure to relieve the governor oit' fuel pressure and spring load; a speed sensitive device closing the governor valve as the speed increases; and a bypass between the in let chamber and the controlling valve chamber. f f

5. In a gas engine control mechanism, the combination of a control valve; a governor frame; a shaft fixed in the shaft; a governor head mounted on the frame governor Weights carried by the governor head; a sleeve mounted on the shaft and actuated by the'governor Weights; a spring Within the sleeve resisting the movement of the sleeve; and a lever communicating the movement of the sleeve to the Y '7. In a eas engine control mechanism .the

"ci L 7 combination of a control valve; a governor frame; ashaft iXed in the frame; governor head mounted on the frame; governor yeights carried by the governor head; a sleeve actuated by the governor Weights; a spring Within the sleeve resisting the movement of the sleeve; a stein on the valve; a spring tending to open the valve; a lever mechanism communicating the movement of the sleeve to the stem to close the valve; and a safety stop operating 'on the stem to close the valve. Y

8. ln a gas engine control mechanism, the combination of a valve; a frame; a stationary shaft mounted in the frame; a Vgovernor head lll) rotatively mounted on the shaft; al sleeve slidingly mounted on the shaft; means for looking the sleeve rotatively-With the head; governor' Weights carrie-d bythe head and oommunioating a movement of the sleeve; a spring resisting the movement ofthe sleeve; means communicating the movement of the sleeve to the valve; and meansfor introducing lubrication-for the head through the shaft.

9. In a gas engine control mechanism, the

`Combination of a valve; a frame; a stationary shaft mounted in the frame; a governor head rotatively mounted on the shaft; a sleeve slidingly mounted on the shaft; means for loeking the sleeve rotatively with the head; governor Weights carried by the head and oommunieating a movement of the sleeve; a .spring resisting the movement oi' the sleeve; means Communicating the movement of the sleeve to the valve; and a nut operating on the shaft for adjusting the spring.

l0. In a gas engine control mechanism,

the combination of a valve; a frame; a shaft and a lever pivotally connected to the yoke communicating the movement of the sleeve to the valve.

11. ln a valve mechanism for gas engines, the combination of a valve body having a controlling valve seat and a throttle valve seat, the axis of said seats being at right angles to each other; a Controlling valve operating on the controlling valve seat; a throttle valve Comprising a head opening and Closing by a movement toward and from said throttle valve seat; and a bypass delivering gas past. the throttle valve when closed to provide the engine with an idling supply.

In testimony whereof I have hereunto setA my hand.

HARRY D. MURRAY 

